Question

A recent study found that electrons that have energies between 3.15 eV and 20.9 eV can cause breaks in a DNA molecule even though they do not ionize the molecule. If a single photon were to transfer its energy to a single electron, what range of light wavelengths could cause DNA breaks?

minimum wavelength: ??? nm

maximum wavelength: ??? nm

In which part of the electromagnetic spectrum does this light lie?

gamma ray

radio

ultraviolet

infrared

Answer 1

E_min = (6.63 x 10^-34 x 3 x 10^8)/(20.9 x 1.6 x 10^-19)

E_min = 5.95 x 10^-8 m = 59.48 nm

E_max = (6.63 x 10^-34 x 3 x 10^8)/(3.15 x 1.6 x 10^-19)

E_max = 394.64 nm

B)

ultraviolet

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